Apparatus for rolling seamless pipes



June 28, 1932. R URBAN APPARATUS FOR ROLLING SEAMLESS PIPES Filed March15, 1928 2 Sheets-Sheet R. URBAN June 28, 1932.

APPARATUS FOR ROLLING SEAMLESS PIPES Filed March 15, 1928 2 Sheets-Sheet2 fili 00000 wlwi I mi Patented June 28, 1932 UNITED STATES RUDOLFURBAN, OF PODBREZOVA, CZEGHOSLOVAKIA.

APPARATUS FOR ROLLING SEAMLESS PIPES Application filed March 13, 1928,Serial No. 261,313, and in Czechoslovakia March 15, 1927.

by the Work is transferred for the purpose of treatment from one pair ofrolls to the next following second, third, etc., by means of the mandrelon which the work has been placed by the treatment in one pair of rolls.In this way it becomes possible to do the whole of the rolling with oneheating of the work. It is at the same time immaterial whether ingots ofsolid cross section, or ingots already holed are being treated.

By means of the apparatus of the present invention, seamless tubes ofmaximum or minimum diameter can be manufactured.

A construction of apparatus embodying the invention is illustrated bywayof example in the accompanying drawings, in which Figure '1 is a sideelevation, partly in section, of an apparatus embodying the invention.

Figure 2 is a similar view showing the parts in a diflerent position.

Figure 3 is a detail section, on an enlarged scale of the mandrel andabillet thereon.

Figure 4 is a plan.

Figure 5 is a plan of=portion of the apparatus, taken beneath the'baseplate J'Eor the mandrel supporting slide.

In the construction illustrated, the block or billet 1, which has beenraised to a bright red heat is perforatedby action of the first pair ofrolls I, forcing it over the hollow mandrel 2, against the removablepoint 3. r

The mandrel 2 is mounted in an adjustable bracket 4 by means of a doubleT-piece 5, and encloses a pipe by which water, admitted into the boredcross-pin of the piece 5, is guided to the end of the mandrel from whichit escapes through suitable openings.

The end of the cross-pin 5 oppositethat at which water enters, and.which projects out of the bracket 4, carries a gear wheel 8 which canmesh with a fixed rack 9.

When, therefore, the bracket 4 is moved from adjacent the pair of rollsI toward the pair of rolls II (or from the position shown in full linesin Figure 1 to the position indicated by dotted lines) the point 3 willbe rethe rack 9, during movement of the bracket 4 1 to the right inFigure 1 from the full line position, the mandrel will be turned throughan angle of 180 and with its end positioned within the workin range ofthe second pair of rolls II in whic the work is subjected to furthertreatment.

If a third and succeeding working operation is to be carried out,another mandrel receives the work from the pair of rollsII and bringsit, in the manner just described, into position to be operated upon by athird pair of rolls, and from the latter to other following pairs ofrolls, if necessary.

If, however, the rolling of the pipe or tube is finished in the pair ofrolls II, it is moved by the cooperating mandrel 10 of such rolls andconveylng means 11 into a calibrating and straightening machine (notshown). The head 3 for initially forming a bore in the billet is notreplaced on the mandrel when the tube is acted upon by the pair of rollsII or sub se uent pairs of such rolls. As shown in Figure 3, thediameter of the free end of the mandrel 2 is substantially that of themandrel 10 and the action of the rolls II is to draw the tubular billetfrom the mandrel 2' onto the' mandrel 10.

The movement of the bracket 4' from operative relation to the pair ofrolls I into similar relation to the pair of rolls II and back again, iseffected by shaft 12 which is connected by suitable gearing with theshafts of the rolls I.

The shaft 12 carries two cams 14, 15, which act on the ends of rotatablymounted double pose of bringing it into position to be acted on by thepair of rolls II, there is mounted on the bracket 4 a double arm lever22, one end of which extends into position to strike a stop 23 as themandrel supporting bracket 4 is shifted from the full line to the dottedline position (Figure 1). v

The upper end of the lever 22 is thereby moi'ed toward the pair of rollsII and moves the work longitudinally of the mandrel away from a sleeve24, which work is held in a fork at the end of the lever, and advancesthe work.

In the illustrated embodiment of the invention the train of gearingbefore referred to for connecting the shafts of the first pair of rollswith the shaft 12 includes a pinion 35 geared to the rolls and meshingwith a gear 36 on the shaft 12. i

T he. work 1 is introduced into the first pair of rolls I by means of alever 29, the movement of which is dependent on that of the lever 21(being connected to said lever by a rod 30) in such a manner that themandrel is introduced at one side, whilst the work is simultaneouslyintroduced at the other side into operative relation to the members ofthe first pair of rolls I.

\Vhat is claimed is 1. In an apparatus for rolling seamless, weldless.pipes or tubes, the combination of a pair of rolls, a reciprocablemandrel support, a mandrel mounted on said support to swing about ahorizontal'axis adjacent one end and adapted to be positioned to receivea perforated billet from the pass between said rolls, a pinion connectedwith the mandrel and in co-a-xial relation to the said horizontal axisthereof, 'a relatively stationary rack adapted to cooperate with saidpinion to oscillate the mandrel as its support is reciproca-ted, meansfor reciprocating the mandrel support, and means actuated by movement ofthe mandrel support after the mandrel has been turned through an angleof approximately 180 for stripping the perforated billet from themandrel.

2. In an apparatus for rolling seamless, weldless, pipes or tubes, thecombination of a pair of rolls, a rcciprocable mandrel support, amandrel mounted on said support to swing above a horizontal axisadjacent one end and adapted to be positioned to receive a perforatedbillet from the pass between said rolls, a pinion connected with themandrel and in co-axial relation to said horizontal axis thereof, arelatively stationary rack adapted to cooperate with said pinion tooscillate the mandrel as its support is reciprocated, means forreciprocating the mandrel support, and means actuated by movement of themandrel support after the mandrel has been turned through an angle ofapproximately 180. and the pinion has moved out of engagement with therack, for

stripping the perforated billet from the mandrel. i

3. In an apparatus for rolling seamless, weldless, pipes or tubes, thecombination of two pairs of rolls arranged with their passes insubstantial alignment, a mandrel support arranged between the pairs ofrolls and adapted to be bodily reciprocated in a direction substantiallyat right angles to the axes of said rolls, a mandrel mounted to turnbodily about a substantially horizontal axis on said support and tobepositioned to cooperate with one of the pairs of rolls to receive aperforated billet therefrom or to present such perforated billet inalignment with the pass between the other pair of rolls, a relativelystationary rack, a pinion connected with the mandrel in co-axialrelation to said horizon tal axis thereof, and adapted to engage therack as the mandrel support is reciprocated to turn the mandrel throughan angle of approximately 180 and from operative relation to the firstpair of rolls to operative relation to the second pair of rolls, andmeans for reciprocating the mandrel support.

4. In an apparatus for rollin seamless, weldless, pipes or tubes, thecombination of two pairs of rolls arranged with their passes insubstantial alignment, a mandrel support arranged between the pairs ofrolls and adapted to be. bodily reciprocated in a directionsubstantially at right angles to the axes of said rolls, a mandrelmounted to turn bodily about a substantially horizontal axis on saidsupport and to be positioned to cooperate with one of the pairs of rollsto receive a perforated billet therefrom or to present such perforatedbillet in alignment with the pass between'the other pair of rolls, arelatively stationary rack, a pinion connected with the mandrel inco-axial relation to said horizontal axis thereof and adapted to engagethe rack as the mandrel support is reciprocatedto turn the mandrelthrough an angle of approximately 180 and from operative relation to thefirst pair of'rolls to operative relation to the second pair of rolls,means for reciprocating the mandrel support, a second mandrel extendinginto the pass between the members of the second pair of rolls, and meansactuated by movement of the mandrel support, after the pinion has passedfrom engagement with said rack, for moving the perforated billet fromthe first said mandrel on to the other mandrel.

5. In an apparatus for rollin seamless, weldless, pipes or tubes, thecom ination of a pair of rolls, a reciprocable mandrel support, amandrel mounted on said support to swing about a horizontal axis, andadapted to be positioned to receive a perforated billet from the passbetween said rolls, a pinion connected with the mandrel and in co-axialrelation to said horizontal axis thereof, a relatively stationary rackadapted to cooperate with said pinion to oscillate the mandrel as itssupport is reciprocated, means actuated by the driving shaft of therolls for reciprocating the mandrel support, and means 5 actuated bymovement of the mandrel support after the mandrel has been turnedthrough an angle of approximately 180 for stripping the perforatedbillet from the manre w 6. In an apparatus for rollin seamless,weldless, pipes or tubes, the com ination of a pair of rolls, areciprocable mandrel support, a mandrel mounted on said support to swingabout a horizontal axis, and adapted 1 to be positioned to receive aperforated billet from the pass between said rolls, a pinion connectedwith the mandrel and in co-axial relation to said horizontal axisthereof, a relatively stationary rack adapted to cooperaa ate with saidpinion to oscillate the mandrel as its support is reciprocated, meansaotuated by the driving shaft of the rolls for reciprocating the mandrelsupport, including two levers fulcrumed intermediate their ends 25 andconnected to the mandrel support, a second pair of levers connected bylinks to the first said pair, a pair of rotatable cams for rocking saidlevers to reciprocate the mandrel support, and means for automaticallystripso ping the perforated billet from the mandrel after'it has beenturned through an angle of ap roximately 180.

In an apparatus for rolling seamless, Weldless, pipes or tubes, thecombination of as a pair of rolls, a reciprocable mandrel support, amandrel mounted on said support to swing about a horizontal axis, apinion connected to the mandrel and in co-axial relation to saidhorizontal axis thereof, a relative w ly stationary rack adapted tocooperate with said pinion to oscillate the mandrel as its support isreciprocated, means for reciprocating the mandrel support, a forkpivotally I mounted on the mandrel support and adapted to have themandrel extend between its members when it has been turned through anangle of approximately 180, and means for rocking said fork to strip theperforated billet from the mandrel body by movement 5 of the mandrelsupport after the pinion has passed from engagement with the rack.

RUDOLF URBAN.

